From 59338f754a55f07857342dbcd81652a4f091d72f Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
Date: Sat, 31 Aug 2013 01:04:07 -0400
Subject: [PATCH] ftrace: Fix a slight race in modifying what function callback
 gets traced

There's a slight race when going from a list function to a non list
function. That is, when only one callback is registered to the function
tracer, it gets called directly by the mcount trampoline. But if this
function has filters, it may be called by the wrong functions.

As the list ops callback that handles multiple callbacks that are
registered to ftrace, it also handles what functions they call. While
the transaction is taking place, use the list function always, and
after all the updates are finished (only the functions that should be
traced are being traced), then we can update the trampoline to call
the function directly.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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